, everyone, i'm robert jordan. >> and i'm jackie bangeric kirschner. >> dan is live on the city's south side with more. >> bob and jackie, impressive response by the chicago fire department. more than 150 firefighter on the scene. one man, serious to critical condition. two other children were injured in this explosion, but we are told they are in good condition, expected to make a full recovery. joining me, chief from the chicago fire department. tell us what happened here tonight. >> at approximately 7:27 this evening, the we received phone calls from a possible house explosion. 12247 south oneda. fire department responded. full response, but due to the nature of the americansy, they immediately elevated it to a stolen box, what we call the stolen box response, due to a possible gas explosion, right now, it's under investigation and until we can determine what the cause was, it's to be determined because we don't know what caused it. >> was there a fire on the scene? >> the first arriving companies did not report a fire, which is not uncommon. it's potential that the fire blew itself out.